body {
  width: 100%;
  min-width: 320px;
  max-width: 640px;
  margin: 0 auto;
  font-family: -apple-system, Helvetica, sans-serif;
  font-size: 14px;
  color: #666;
  line-height: 1.5;
}
ul{
  list-style: none;
  margin: 0;
  padding: 0;
}
a {
  color: #666;
  text-decoration: none;
}
img {
  vertical-align: middle;
}
/*点击高亮我们需要清除清除  设置为transparent 完成透明*/

* {
  -webkit-tap-highlight-color: transparent;
}


/*在移动端浏览器默认的外观在iOS上加上这个属性才能给按钮和输入框自定义样式*/

input {
  -webkit-appearance: none;
}


/*禁用长按页面时的弹出菜单*/

img,
a {
  -webkit-touch-callout: none;
}
.app {
  height: 45px;
}
.app ul li {
  float: left;
  height: 45px;
  line-height: 45px;
  background-color: #333;
  text-align: center;
  color: white;
}
.app ul li:nth-child(1) {
  width: 8%;
}
.app ul li:nth-child(1) img {
  width: 10px;
}
.app ul li:nth-child(2) {
  width: 10%;
}
.app ul li:nth-child(2) img {
  width: 30px;
  vertical-align: middle;
}
.app ul li:nth-child(3) {
  width: 57%;
}
.app ul li:nth-child(4) {
  width: 25%;
  background-color: #f66515;
}
.search-wrap {
  position: fixed;
  height: 44px;
  min-width: 320px;
  max-width: 640px;
  width: 100%;
  overflow: hidden;
}
.search-btn {
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 44px;
}
.search-btn::before{
  content: "";
  display: block;
  width: 20px;
  height: 18px;
  background: url(../images/s-btn.png) no-repeat;
  background-size: 20px 18px;
  margin: 14px 0 0 15px;
}
.search-login {
  position: absolute;
  right: 0;
  top: 0;
  width: 40px;
  height: 44px;
  line-height: 44px;
  text-align: center;
  color: white;
}
.search {
  position: relative;
  height: 30px;
  margin: 0 50px;
  background-color: #fff;
  border-radius: 15px;
  margin-top: 7px;
}
.jd-icon {
  width: 20px;
  height: 15px;
  position: absolute;
  top: 8px;
  left: 13px;
  background: url(../images/jd.png) no-repeat;
  background-size: 20px 15px;
}
.jd-icon::after {
  content: '';
  display: block;
  width: 1px;
  height: 15px;
  position: absolute;
  background-color: #ccc;
  top: 0;
  right: -8px;
}
.sou {
  position: absolute;
  top: 8px;
  left: 50px;
  width: 18px;
  height: 15px;
  background: url(../images/jd-sprites.png) no-repeat -81px 0;
  background-size: 200px auto;
}
.slider img {
  width: 100%;
}
.swiper-container {
  width: 100%;
  height: 100%;

}
.swiper-slide {
  text-align: center;
  font-size: 18px;
  background: #fff;

  /* Center slide text vertically */
  display: -webkit-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  -webkit-align-items: center;
  align-items: center;
}
.brand div{
  float: left;
  width: 33.33%;
}
.brand div img {
  width: 100%;
}
.barnd {
  border-radius: 2px 2px 0 0;
}
/* nav  */
nav {
  padding-top: 5px;
}
nav a {
  float: left;
  width: 20%;
  text-align: center;
}
nav a img {
  width: 40px;
  margin: 10px 0;
}
nav a span {
  display: block;
}
/* news */
.news {
  margin-top: 20px;
}
.news a {
  float: left;
  /* CSS3 盒子模型，盒子的宽度包含border和padding */
  box-sizing: border-box;
}
.news a:nth-child(1) {
  width: 50%;
}
.news a:nth-child(n+2) {
  width: 25%;
  border-left: 1px solid #ccc;
}
.news img {
  width: 100%;
}
